如何在 Symfony2 Doctrine 中使用级联选项? [英] How do I use the cascade option in Symfony2 Doctrine?

问题描述

我正在尝试理解 cascade 选项在 Symfony2 的 Doctrine 中.

I'm trying to understand the cascade option in Doctrine in Symfony2.

我希望能够删除子实体(并且不会触发外键约束错误.)

I would like to be able to delete a child entity (and not trigger the foreign key constraint error.)

我有 3 个实体:

举报

/**
* @ORMOneToMany(targetEntity="Response", mappedBy="report")
*/
protected $responses;

/**
* @ORMOneToMany(targetEntity="Response", mappedBy="report")
*/
protected $sms;

回应

/**
 * @ORMManyToOne(targetEntity="Report", inversedBy="responses")
 */
protected $report;

短信

/**
 * @ORMManyToOne(targetEntity="Report")
 */
protected $report;

现在我想删除一个 Response 实体，但我得到了

Now I would like to delete a Response entity but I get

SQLSTATE[23000]:违反完整性约束:1451 无法删除或更新父行:
外键约束失败 (mybundle.sms, CONSTRAINT FK_B0A93A77BB333E0D FOREIGN KEY (reportId) REFERENCES report (id))

SQLSTATE[23000]: Integrity constraint violation: 1451 Cannot delete or update a parent row:
a foreign key constraint fails (mybundle.sms, CONSTRAINT FK_B0A93A77BB333E0D FOREIGN KEY (reportId) REFERENCES report (id))

在哪里使用 cascade 选项以及应该使用哪个选项(detach 或 remove)?

Where do I use the cascade option and which option should I use (detach or remove)?

我可以做很多试验和错误来解决这个问题，但我希望得到专家的解释，所以我不会忽略一些事情.

I can do a lot of trial and error to figure this out, but I was hoping for an expert explanation, so I don't overlook something.

推荐答案

尝试使用

/**
 * @ORMManyToOne(targetEntity="Report", inversedBy="responses")
 * @ORMJoinColumn(name="reportId", referencedColumnName="id", onDelete="CASCADE")
 */
protected $report;

然后更新你的架构.它将添加数据库级级联

And then update yor schema. It will add database level Cascading

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